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  1. #41
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    Quote Originally Posted by scott_walker
    when i pushed the power on button the z axis started moving downwards
    Late to the thread but I've had the same issue on my TNC355 control with the Z axis on startup when the control is cold (65°F or below). Mine never gets to the limit as it errors out with "Gross Position Error D". I now use a heater that I place next to the control for about an hour before startup and don't have any issues. I need to stop being lazy and take the control apart to find the problematic components. Would love to see pics of the damage if you have them scott_walker.

  2. #42
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    That is exactly what happened mine. On initial inspection i thought it was a small 250mA fuse but it was actually a small transformer on the board had exploded and the flames had burnt the fuse out.

    I ended up finding a faulty board and was able to make one good board out of the two.

    img_0265.jpg

    img_0359.jpgimg_0263.jpg

    Had a closer look at the program that i wrote earlier and it seems to be after a CC and C move if there is a linear move it writes a X,Y,Z line. I have edited the part to include a fillet where the straight line would be so it does away with it.

    img_0419.jpg

    img_0423.jpg

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  4. #43
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    Also another note. The Post writes M91 at the start and end of the program. Looked it up and it will move the Z axis towards the table. so will have to just edit that line out each time.

  5. #44
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    Thanks for sharing the pics. I'll have to see if there are similarities between the TNC145 and TNC355 servo boards.

  6. #45
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    Quote Originally Posted by scott_walker View Post
    Ok so major break through this evening. Using the bought cable and an old pc with serial port i have been able to transfer programs to and from the machine.
    Congratulations!

  7. #46
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    I might be able to send you a post that I edited the radical wrong stupid idiot z move out of

    it is trying to move z to absolute zero I think, and on my machine it 'crashed' the z up. just hit the limit switch, but that does not happen. not an error message, actually hit the limit switch. first time in 27 years

  8. #47
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    Scott, I have spares of those Bosch servo boards if you get further problems.

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